This book focuses on Yahweh, the "God of justice", in the prophetic book of Isaiah. Each of Isaiah's three parts highlights justice in its own unique way. In Isaiah 1-39 the focus of justice is fidelity and judgment. In Isaiah 40-55 justice is treated as a manifestation of Yahweh's sovereignty and comparability; Yahweh and his servant are the exclusive agents of justice. And in Isaiah 56-66 justice is an obligation of the covenant that can be realized only through divine intervention.